Acetyl-cellulose compound and method of making same.



PATENT anion.

WILLIAM GODSON LINDSAY, OF NEW YORK, N. Y ASSIGNOR TO THE GELLULfiI COMPANY, A CORPORATION OF NEW JERSEY.

' ACETYL-CELLULOSE COMPOUND AND METHOD OF MAKING SAME.

No Drawing.

similar substances. My new composition of matter possesses permanently a high degree of strength and tenacity.

My invention relates also to the process of making a substitute for nitro-cellulose compositions.-

More particularly, this invention relates to treating an acetyl cellulose with a substance which arrests any tendency todecomposition and efl'ectually prevents deterioration, the product being strong and tenacious and retaining these characteristics notwithstanding its age or amount of handling.

Previous to my invention, it has been suggested to employ certain cellulose c'ombinations as a substitute for nitro-cellulose, but many difliculties have been met with in attempting to adapt cellulose combinations to such purposes. These proposed substitutes have been found to be defective, principally in strength and tenacity, and in many cases exhibiting brittleness due to innate or induced decomposition. The product formed by my invention is free from brittleness and retains its strength and tenacity for an in- Specification of Letters Patent.

As an example of the acetyl cellulose combination or solution above referred to, I mention an acetyl cellulose mixture in solution or in a menstruum and containing triphenylphos'phate, or equivalent substance. The product thus formed is non-inflammable, transparent, and possesses a degree of strength and tenacity which is made permanent by the addition of urea as hereinde scribed. T have found that the urea remains a part of the final dried composition and effectually prevents high temperature or age from making .such compound weak or brittle. The product made in accordance with my invention is particularly useful in making strong films, although, it will be understood, my product is of high utility when used in a mass. v

-Having thus described my invention, I declare that what I claim as new and desire to secure by Letters Patent, is l 1. A composition of matter containing an acetyl cellulose compound in combination with urea, the latter being in suitable proportions to secure strength and tenacity of a permanent character.

2. The process of making a composition of matter consisting in combining acetyl cellulose and urea by the use of a solvent or menstruum. a I

The process of forming a composition of matter which consists in dissolving acetyl cellulose in a solvent and adding urea thereto.

Patented Dec. 3, 1%12.

Application filed May 5, 1909. Serial No. 494,179.

4. The process of forming a compositionof matter which consists in combining 100 parts acetylcellulose with 1 to 2 parts of. urea by the use of a solvent or menstruum.

Correction in Letters Patent No. 1,045,990.

It is hereby certified that in Letters Patent No. 1,045,990, granted December 3,

1912, upon the application of William Godson Lindsey, of New York; N Y'., for an improvement in Acetyl-Oellulose Compoiihde and Methods of Making Same.

on error appears in the printed specification reqi iring correction as follows; Page 1,"

line 74, for the Word secure read inseam, and that the said Letters Patent should be readwith this correction therein that the same maty'conform the record of the case iri the Patent Ofiice.

Signed and sealed this 24th dey of December, A.. D., 1912.

C. C. BILLINGS,

Acting Commission of Patents.

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